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arXiv 2204.02607math.NAcs.NA
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无界域上三维位势问题的一种配置IGA-BEM

A collocation IGA-BEM for 3D potential problems on unbounded domains

Antonella Falini, Carlotta Giannelli, Tadej Kanduc, Maria Lucia Sampoli, Alessandra Sestini

摘要:

本文用边界元法(BEM)求解三维无界域上位势问题的数值解,因为这样只在边界上研究问题,从而避免了对无限域的任何有限逼近。等几何分析(IGA)的设置被认为是,特别是B样条和NURBS函数考虑。为了充分利用样条空间的所有优点,一个重要的问题是弱奇异积分和近似奇异积分的具体求积公式。我们的建议是基于样条准插值和使用样条产品的公式。除此之外,一个强大的奇异性提取过程作为一个初步的步骤,并通过一个有效的功能的功能组装阶段。数值算例表明,所得到的数值解达到了预期的收敛阶。

英文摘要:

In this paper the numerical solution of potential problems defined on 3D unbounded domains is addressed with Boundary Element Methods (BEMs), since in this way the problem is studied only on the boundary, and thus any finite approximation of the infinite domain can be avoided. The isogeometric analysis (IGA) setting is considered and in particular B-splines and NURBS functions are taken into account. In order to exploit all the possible benefits from using spline spaces, an important point is the development of specific cubature formulas for weakly and nearly singular integrals. Our proposal for this aim is based on spline quasi-interpolation and on the use of a spline product formula. Besides that, a robust singularity extraction procedure is introduced as a preliminary step and an efficient function-by-function assembly phase is adopted. A selection of numerical examples confirms that the numerical solutions reach the expected convergence orders.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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